CN202923545U - Loading and unloading switching device and load-sensitive hydraulic system - Google Patents
Loading and unloading switching device and load-sensitive hydraulic system Download PDFInfo
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- CN202923545U CN202923545U CN 201220578803 CN201220578803U CN202923545U CN 202923545 U CN202923545 U CN 202923545U CN 201220578803 CN201220578803 CN 201220578803 CN 201220578803 U CN201220578803 U CN 201220578803U CN 202923545 U CN202923545 U CN 202923545U
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Abstract
The utility model relates to a loading and unloading switching device and a load-sensitive hydraulic system. The loading and unloading switching device comprises a loading and unloading switching valve, a loading high-pressure oil circuit and an unloading high-pressure oil circuit, wherein the loading and unloading switching valve comprises a main valve and a pilot valve; the pilot valve is provided with a control port, a first oil outlet, a second oil outlet and a first oil return port; the main valve is provided with a first oil inlet, a second oil inlet, a loading oil outlet, an unloading oil outlet and a high-pressure oil inlet; the control port is communicated with an oil outlet of a pump; the first oil outlet is communicated with the first oil inlet; the second oil outlet is communicated with the second oil inlet; the loading oil outlet is communicated with the loading high-pressure oil circuit; the unloading oil outlet is communicated with the unloading high-pressure oil circuit; the first oil return port is communicated with an oil tank; and the high-pressure oil inlet is communicated with the oil outlet of the pump. The loading and unloading switching device with a pilot structure can be applied to a high-flow hydraulic system.
Description
Technical field
The utility model relates to a kind of hydraulic technique field, relates in particular to a kind of shifter and be provided with the load-sensitive hydraulic system of the shifter of getting on or off the bus of getting on or off the bus.
Background technology
Usually, emergency repair rescue outfit car consists of (as shown in Figure 1) by get off A and the B two parts of getting on the bus.Before emergency repair rescue outfit car carried out rescue work, the supporting leg C of the A that must first launch to get off carried out the safety and stability requirement of rescue work to satisfy vehicle.After the supporting leg C of the A that gets off launches, can operate again the B that gets on the bus, carry out the rescue operation.How the action of emergency repair rescue outfit car drives hydraulic actuator by power hydraulic system is realized, and adopts load-sensitive hydraulic system to improve hydraulic efficiency pressure system efficient.And realize that with the B that gets on the bus the effect of the shifter of getting on or off the bus of a certain moment single movement seems particularly important as the A that gets off that makes the rescue equipment.Below introduce in detail the principle of work of the transfer valve of getting on or off the bus.
Fig. 2 is the existing shifter principle schematic of getting on or off the bus.As shown in Figure 2, get on or off the bus that shifter comprises the transfer valve 2 ' of getting on or off the bus, shuttle valve 4, the high-pressure oil passage 5 of getting off, the high-pressure oil passage 6 of getting on the bus, primary feedback oil circuit 7, get on the bus feedback oil circuit 8 and the feedback oil circuit 9 of getting off.Wherein: the oil inlet P of the transfer valve 2 ' of getting on or off the bus connects the oil outlet of pump 1, and the first actuator port Ax of the transfer valve 2 ' of getting on or off the bus meets by the high-pressure oil passage 5 of getting off the A that gets off, and the second actuator port As of the transfer valve 2 ' of getting on or off the bus connects car B by the high-pressure oil passage 6 of getting on the bus.Get on or off the bus and be connected fuel tank 3 by the first by pass valve 10 between the oil outlet of oil inlet P and pump 1 of transfer valve 2 '.The oil outlet of shuttle valve 4 connects the oil inlet of primary feedback oil circuit 7, i.e. the flow feedback port Lx of pump 1.The first oil inlet 41 of shuttle valve 4 connects the feedback oil circuit 8 of getting on the bus, and the second oil inlet 42 of shuttle valve 4 connects the feedback oil circuit 9 of getting off.
By the get on or off the bus break-make of the electromagnet Y1 on transfer valve 2 ' of control, can realize that oil circuit switches.Oil circuit switches specifically: electromagnet Y1 energising, and high pressure oil switches to the first actuator port Ax, and the flow direction of high pressure oil switches to the high-pressure oil passage 5 of getting off, and gives the A fuel feeding of getting off.Electromagnet Y1 no power, high pressure oil switch to the second actuator port As, and the flow direction of high pressure oil switches to the high-pressure oil passage 6 of getting on the bus, and give the B fuel feeding of getting on the bus.
When getting off the A action, the load pressure signal of getting off flows to primary feedback oil circuit 7 successively via feedback oil circuit 9, the shuttle valve 4 of getting off.When getting on the bus the B action, the load pressure signal of getting on the bus flows to primary feedback oil circuit 7 successively via feedback oil circuit 8, the shuttle valve 4 of getting on the bus.The oil outlet of primary feedback oil circuit 7 connects the feedback port of pump 1, with the high pressure oil delivery volume of control pump 1.
But there is following problem in prior art: the electromagnet Direct Action Type that the transfer valve 2 ' of 1, getting on or off the bus adopts drives, and drive torque is large, and through-current capacity is little, can only be used for the hydraulic efficiency pressure system of low discharge; 2, valve body is interior without filter, and the load pressure fluctuation signal can be directly delivered to oil pump, causes thrashing; 3, get off the feedback oil circuit without relief arrangement, can not be applicable to the non-loading sensitive valve.
The utility model content
The purpose of this utility model is to propose a kind of get on or off the bus shifter and load-sensitive hydraulic system that can be used in the hydraulic efficiency pressure system of large flow, has realized safe, the stable switching flow control of getting on or off the bus of heavy traffic load sensory system.
For achieving the above object, the utility model provides following technical scheme:
A kind of shifter of getting on or off the bus comprises: the transfer valve of getting on or off the bus, get on the bus high-pressure oil passage and the high-pressure oil passage of getting off; Wherein: the described transfer valve of getting on or off the bus comprises main valve and priority valve, described priority valve has the mouth of control, the first oil outlet, the second oil outlet and the first return opening, and described main valve has the first oil inlet, the second oil inlet, the oil outlet of getting on the bus, get off oil outlet and high pressure oil inlet; Described control mouth communicates with the oil outlet of pump, described the first oil outlet communicates with described the first oil inlet, described the second oil outlet communicates with described the second oil inlet, and the described oil outlet of getting on the bus communicates with the described high-pressure oil passage of getting on the bus, and the described oil outlet of getting off communicates with the described high-pressure oil passage of getting off; Described the first return opening communicates with fuel tank, and the oil outlet of described high pressure oil inlet and described pump communicates; Described priority valve must not the electricity state under, high pressure oil through described pump output enters described control mouth, introduce described the first oil inlet via described the first oil outlet again, promote the right position connection of described main valve, the pressure oil of described high pressure oil inlet is supplied with the described high-pressure oil passage of getting off by the described oil outlet of getting off, and enters the mode of operation of getting off; Described priority valve gets under electric state, high pressure oil through described pump output enters described control mouth, introduce described the second oil inlet via described the second oil outlet again, promote the left position connection of described main valve, the pressure oil of described high pressure oil inlet is supplied with the described high-pressure oil passage of getting on the bus by the described oil outlet of getting on the bus, and enters the mode of operation of getting on the bus.
Further, also comprise: the first by pass valve, described the first by pass valve are arranged on the oil outlet and the pipeline between described fuel tank of described pump; When the pressure of described delivery side of pump surpasses the safe pressure of described the first by pass valve setting, described the first by pass valve is opened, the high pressure oil of the oil outlet of described pump is back to described fuel tank by described the first by pass valve, until the pressure of described delivery side of pump reaches the safe pressure of described setting.
Further, also comprise: shuttle valve, primary feedback oil circuit, get on the bus feedback oil circuit and the feedback oil circuit of getting off; Wherein: described shuttle valve, its oil outlet connects the oil inlet of described primary feedback oil circuit, and the first oil inlet connects the described feedback oil circuit of getting on the bus, and the second oil inlet connects the oil outlet of the described feedback oil circuit of getting off; The described feedback oil circuit of getting off connects the described high-pressure oil passage of getting off; The oil outlet of described primary feedback oil circuit connects the feedback port of described pump, to control the variable of described pump; When getting on the bus mode of operation, described load feedback pressure signal of getting on the bus via described feedback oil circuit, the shuttle valve of getting on the bus, flows to described primary feedback oil circuit successively; When getting off mode of operation, described load feedback pressure signal of getting off via described feedback oil circuit, the shuttle valve of getting off, flows to described primary feedback oil circuit successively.
Further, also comprise: the second by pass valve, described the second by pass valve are arranged on second oil inlet and the pipeline between described fuel tank of described shuttle valve; When the pressure of the second oil inlet of described shuttle valve surpasses the safe pressure that described the second by pass valve sets, described the second by pass valve is opened, the described feedback oil circuit of getting off flows back to described fuel tank by described the second by pass valve, until the pressure of the second oil inlet of described shuttle valve reaches the safe pressure of described setting.
Further, also comprise: unloader valve, described unloader valve are arranged on second oil inlet and the pipeline between described fuel tank of described shuttle valve; Get off when not working when described, the described feedback oil circuit of getting off flows back to described fuel tank by described unloader valve.
Further, also comprise: the first damping, described the first damping is arranged on the described high-pressure oil passage of getting off.
Further, also comprise: the second damping, described the second damping are arranged on the described feedback oil circuit of getting off.
Further, described pump is load sensitive pump.
Further, described main valve is three position four-way directional control valve, three position three-way change valve, two-position four way change valve or two position three way directional control valve.
The utility model also provides a kind of load-sensitive hydraulic system, and it comprises the shifter of getting on or off the bus of above-mentioned any one.
Based on the arbitrary technical scheme in technique scheme, the utility model embodiment can produce following technique effect at least:
Be arranged to comprise the pilot-operated type structure of main valve and priority valve due to the transfer valve of getting on or off the bus of the present utility model, make through the high pressure oil of pump output and first introduce main valve via priority valve, enter by main valve get on the bus high-pressure oil passage or the high-pressure oil passage of getting off again, and be respectively the fuel feeding of getting on the bus or get off, compare with the structure of traditional Direct Action Type, the transfer valve of getting on or off the bus that can only be used for the hydraulic efficiency pressure system of low discharge, pilot-operated type structure of the present utility model can be applicable to the operating mode demand of large flow.
Compare with the existing shifter of getting on or off the bus, the utility model has solved the problem that the transfer valve of getting on or off the bus in the prior art can only satisfy the low flow rate condition demand.
In addition, at least also there is following advantage in optimal technical scheme of the present utility model:
1, the utility model is owing to being provided with the first by pass valve on the oil inlet of the transfer valve of getting on or off the bus and the pipeline between fuel tank; therefore no matter be the action of getting off; still the action of getting on the bus; as long as load pressure sudden change; when surpassing the security settings pressure of the first by pass valve; the first by pass valve will be opened; get on or off the bus the high pressure oil of oil inlet of transfer valve by the first by pass valve backflow fuel tank; until the pressure of delivery side of pump reaches the safe pressure value of setting; reach safe off-load, thereby can play the effect of protection pump.
2, the utility model is owing to being provided with the second by pass valve on the second oil inlet of shuttle valve and the pipeline between fuel tank; therefore when getting off the load pressure signal sudden change; pressure surpasses the security settings pressure of the second by pass valve; the second by pass valve will be opened; the feedback of getting off oil circuit flows back to fuel tank by the second by pass valve; until the pressure of the second oil inlet of shuttle valve reaches the safe pressure of setting, thereby played the effect of protecting pump.
3, the utility model is owing to having adopted unloader valve, and when not working when getting off, the feedback of getting off oil circuit flows back to fuel tank by unloader valve, and does not pass to pump, makes pump be in unloading condition, causes waste thereby the pump of having avoided getting off when not working is often opened.
4, the utility model owing to all being provided with damping at get off high-pressure oil passage and the feedback oil circuit of getting off, therefore can play filter action, and the pressure that connects so the hydraulic fluid port fluctuation of getting off can become after overdamping steadily, thereby makes pump be in stable variable state.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, consists of the application's a part, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not consist of improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation of existing emergency repair rescue outfit vehicle;
Fig. 2 is the principle schematic of the existing shifter of getting on or off the bus;
Fig. 3 is the principle schematic of an embodiment of the shifter of getting on or off the bus provided by the utility model;
Fig. 4 is the three position four-way directional control valve of shifter of getting on or off the bus in Fig. 3;
Fig. 5 is the three position three-way change valve of shifter of getting on or off the bus in Fig. 3;
Fig. 6 is the two-position four way change valve of shifter of getting on or off the bus in Fig. 3;
Fig. 7 is the two position three way directional control valve of shifter of getting on or off the bus in Fig. 3;
Mark in figure: 1, pump; 2, the transfer valve of getting on or off the bus; 2 ', the transfer valve of getting on or off the bus; 21, priority valve; 22, main valve; 3, fuel tank; 4, shuttle valve; 41, the first oil inlet of shuttle valve; 42, the second oil inlet of shuttle valve; 5, the high-pressure oil passage of getting off; 6, the high-pressure oil passage of getting on the bus; 7, primary feedback oil circuit; 8, the feedback oil circuit of getting on the bus; 9, the feedback oil circuit of getting off; 10, the first by pass valve; 11, the second by pass valve; 12, unloader valve; 13, the first damping; 14, the second damping;
A, get off; B, get on the bus; C, supporting leg; The oil mass feedback port of Lx, pump; Electromagnet on Y1, the transfer valve of getting on or off the bus; The control mouth of X, priority valve; The first oil outlet of A1, priority valve; The second oil outlet of A2, priority valve; The return opening of T1, priority valve; The first oil inlet of P1, main valve; The second oil inlet of P2, main valve; The high pressure oil inlet of P, main valve; The oil outlet of getting off of Ax, main valve; The oil outlet of getting on the bus of As, main valve.
The specific embodiment
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Fig. 3 is the principle schematic of an embodiment of the shifter of getting on or off the bus provided by the utility model.As shown in Figure 3, the shifter of getting on or off the bus provided by the utility model comprise the transfer valve 2 of getting on or off the bus, get off high-pressure oil passage 5 and the high-pressure oil passage 6 of getting on the bus.Wherein:
The oil inlet P of transfer valve 2 of getting on or off the bus is the high pressure oil entrance, is connected with the oil outlet of pump 1.The the first actuator port Ax of transfer valve 2 of getting on or off the bus meets by the high-pressure oil passage 5 of getting off the A that gets off, and the second actuator port As of the transfer valve 2 of getting on or off the bus connects car B by the high-pressure oil passage 6 of getting on the bus.The high pressure oil of pump 1 output carries out through the transfer valve 2 of getting on or off the bus the switching that oil circuit flows to when getting on or off the bus transfer valve 2 inner passage, controls high-pressure oil flow to A or the B that gets on the bus of getting off.In the present embodiment, what pump 1 adopted is load sensitive pump, and this pump can provide stable flow and required pressure according to system requirements, and has corresponding pressure-flow regulatory function when working conditions change.
What the transfer valve 2 of getting on or off the bus in the utility model adopted is the pilot-operated type structure, specifically comprises: priority valve 21 and main valve 22, wherein:
Control a mouthful X and communicate with the oil outlet of pump 1, the first oil outlet A1 communicates with the first oil inlet P 1, and the second oil outlet A2 communicates with the second oil inlet P 2, and the oil outlet As that gets on the bus communicates with the high-pressure oil passage 6 of getting on the bus, and the oil outlet Ax that gets off communicates with the high-pressure oil passage 5 of getting off.
Oil return inlet T 1 directly communicates with fuel tank 3.The high pressure oil inlet P communicates with the oil outlet of pump 1.
In the present embodiment, what priority valve 21 adopted is two-position four way change valve, also can adopt three position four-way directional control valve.What main valve 22 adopted is three position four-way directional control valve (as shown in Figure 4), also can adopt three position three-way change valve (as shown in Figure 5), can also adopt two-position four way change valve (as shown in Figure 6), also can adopt two position three way directional control valve (as shown in Figure 7).
The transfer valve 2 of getting on or off the bus little with existing through-current capacity, that can only be used for the direct dynamic structure of low discharge hydraulic efficiency pressure system is compared, the action of the main valve 22 of the transfer valve 2 of getting on or off the bus of pilot-operated type structure provided by the utility model is controlled by priority valve 21, therefore goes for the occasion of high-pressure high-flow.
In above-described embodiment, the shifter of getting on or off the bus provided by the utility model can also comprise that the first by pass valve 10, the first by pass valves 10 are arranged on the oil outlet (also can be described as " high pressure oil inlet P ") and the pipeline between fuel tank 3 of pump 1.Particularly, the force value of the oil outlet of pump 1 is the force value of pump 1 outlet, therefore no matter be the A action of getting off, still the B that gets on the bus action, as long as load pressure sudden change, clamping stagnation pause or shake occur such as being similar to certain action, make hydraulic system pressure raise suddenly, at this moment the pressure of the outlet of pump 1 can raise suddenly.When the pressure of the outlet of pump 1 surpasses the safe pressure that the first by pass valve 10 sets; this moment first, by pass valve 10 can be opened; the high pressure oil of the oil outlet of pump 1 is by the first by pass valve 10 backflow fuel tanks 3; until the pressure of the oil outlet of pump 1 reaches the safe pressure value of setting; reach safe off-load, to play the effect of protection pump 1.Therefore, the first by pass valve 10 as a second protection safety valve, prevents from being caused by load changing that to play compression shock damages the hydraulic efficiency pressure system at place in the utility model, make the Hydraulic System Reliability at place higher.
The shifter of getting on or off the bus provided by the utility model can be identical with the existing shifter of getting on or off the bus, and equally also comprises shuttle valve 4, primary feedback oil circuit 7, gets on the bus and feed back oil circuit 8 and get off feedback oil circuit 9.Wherein:
The oil outlet of shuttle valve 4 connects the oil inlet of primary feedback oil circuit 7, and the first oil inlet 41 of shuttle valve 4 connects the feedback oil circuit 8 of getting on the bus, and the second oil inlet 42 of shuttle valve 4 connects the oil outlet of the feedback oil circuit 9 of getting off.The feedback of getting off oil circuit 9 is connected with the high-pressure oil passage 5 of getting off.The oil outlet of primary feedback oil circuit 7 connects the feedback port Lx of pump 1.
When getting off mode of operation, during the A that namely gets off action, the high pressure oil of the high-pressure oil passage 5 of getting off via feedback oil circuit 9, the shuttle valve 4 of getting off, flows to primary feedback oil circuit 7 successively.When getting on the bus mode of operation, during the B that namely gets on the bus action, the high pressure oil of the high-pressure oil passage 6 of getting on the bus via feedback oil circuit 8, the shuttle valve 4 of getting on the bus, flows to primary feedback oil circuit 7 successively.
In the various embodiments described above; for the safety guard-safeguard effect is played in the load pressure signal sudden change (such as hydraulic efficiency pressure system shake, clamping stagnation etc.) in A when work of getting off; the utility model is provided with the second by pass valve 11, and the second by pass valve 11 is arranged on second oil inlet 42 and the pipeline between fuel tank 3 of shuttle valve 4.In the load feedback pressure signal sudden change of getting off, namely when the force value of the second oil inlet 42 of shuttle valve 4 surpasses the safe pressure value that the second by pass valve 11 sets, the second by pass valve 11 can be opened, the feedback of getting off oil circuit 9 flows back to fuel tank 3 by the second by pass valve 11, until the pressure of the second oil inlet 42 of shuttle valve 4 reaches the safe pressure of setting.Because 11 of the second by pass valves play the safety guard-safeguard effect to the load feedback pressure signal sudden change of getting off, therefore security settings pressure ratio first by pass valve 10 setting pressures of the second by pass valve 11 are low.
Due to pump 1 employing in hydraulic efficiency pressure system is load sensitive pump, and the A action of getting off is simple, the general control cock that does not adopt the bringing onto load sensitive function, therefore the utility model is provided with a unloader valve 12 on the feedback oil circuit 9 of getting off, and unloader valve 12 is arranged on second oil inlet 42 and the pipeline between fuel tank 3 of shuttle valve 4.And because the feedback oil circuit 9 of getting off is connected with the high-pressure oil passage 5 of getting off, when working connection switches to when getting off A, the feedback of getting off oil circuit 9 is directly and the oil inlet P of the transfer valve 2 of getting on or off the bus, i.e. the outlet of pump 1 is connected.If do not have unloader valve 12, even when the A that gets off does not work, the delivery pressure of pump 1 also can pass to pump 1 by the feedback oil circuit 9 of getting off, and makes flow increase, and pressure rise is until reach the setting safe pressure of the second by pass valve 11.But, after having adopted unloader valve 12, when the A that gets off does not work, the feedback of getting off oil circuit 9 flows back to fuel tank 3 by unloader valve 12, and do not pass to pump 1, thereby make pump 1 no-output (be discharge capacity be zero), and then make pump 1 be in unloading condition, thereby when the A that avoided getting off does not work, pump 1 often leaves and causes waste.In the present embodiment, what unloader valve 12 adopted is two-position two-way solenoid valve.
In emergency repair rescue outfit car course of action, load is constantly to change, and that is to say that hydraulic system working pressure is to be in fluctuation status, and non-constant.Therefore, the utility model is provided with the first damping 13 and the second damping 14, and the first damping 13 is arranged on the high-pressure oil passage 5 of getting off, and the second damping 14 is arranged on the feedback oil circuit 6 of getting off.When the fluctuation of load is larger, when fluctuation of pressure appears in the hydraulic fluid port that for example meets the A that gets off, if there is no the second damping 14, this fluctuation of pressure can be by the feedback oil circuit 9 of getting off, and be directly delivered on pump 1 through shuttle valve 4, little when large when making the flow of pump 1, be easy to cause the hydraulic efficiency pressure system shake.Increased the first damping 13 and the second damping 14, can play filter action, the pressure that connects so the hydraulic fluid port fluctuation of the A that gets off can become after overdamping steadily, thereby makes pump 1 be in stable variable state.
The utility model also provides a kind of load-sensitive hydraulic system, and it comprises the shifter of getting on or off the bus in the various embodiments described above.The other parts of described load-sensitive hydraulic system can be with reference to prior art, and this paper no longer launches to describe.
Should be noted that at last: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although with reference to preferred embodiment, the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or the part technical characterictic is equal to replacement the specific embodiment of the present utility model; And not breaking away from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.
Claims (10)
1. shifter of getting on or off the bus comprises:
Get on or off the bus transfer valve, get on the bus high-pressure oil passage and the high-pressure oil passage of getting off;
It is characterized in that,
The described transfer valve of getting on or off the bus comprises main valve and priority valve, wherein:
Described priority valve has the mouth of control, the first oil outlet, the second oil outlet and the first return opening, and described main valve has the first oil inlet, the second oil inlet, the oil outlet of getting on the bus, get off oil outlet and high pressure oil inlet;
Described control mouth communicates with the oil outlet of pump, described the first oil outlet communicates with described the first oil inlet, described the second oil outlet communicates with described the second oil inlet, and the described oil outlet of getting on the bus communicates with the described high-pressure oil passage of getting on the bus, and the described oil outlet of getting off communicates with the described high-pressure oil passage of getting off;
Described the first return opening communicates with fuel tank, and the oil outlet of described high pressure oil inlet and described pump communicates;
Described priority valve must not the electricity state under, high pressure oil through described pump output enters described control mouth, introduce described the first oil inlet via described the first oil outlet again, promote the right position connection of described main valve, the pressure oil of described high pressure oil inlet is supplied with the described high-pressure oil passage of getting off by the described oil outlet of getting off, and enters the mode of operation of getting off;
Described priority valve gets under electric state, high pressure oil through described pump output enters described control mouth, introduce described the second oil inlet via described the second oil outlet again, promote the left position connection of described main valve, the pressure oil of described high pressure oil inlet is supplied with the described high-pressure oil passage of getting on the bus by the described oil outlet of getting on the bus, and enters the mode of operation of getting on the bus.
2. device as claimed in claim 1, is characterized in that, also comprises:
The first by pass valve, described the first by pass valve are arranged on the oil outlet and the pipeline between described fuel tank of described pump;
When the pressure of described delivery side of pump surpasses the safe pressure of described the first by pass valve setting, described the first by pass valve is opened, the high pressure oil of the oil outlet of described pump is back to described fuel tank by described the first by pass valve, until the pressure of described delivery side of pump reaches the safe pressure of described setting.
3. device as claimed in claim 1 or 2, is characterized in that, also comprises:
Shuttle valve, primary feedback oil circuit, get on the bus feedback oil circuit and the feedback oil circuit of getting off; Wherein:
Described shuttle valve, its oil outlet connects the oil inlet of described primary feedback oil circuit, and the first oil inlet connects the described feedback oil circuit of getting on the bus, and the second oil inlet connects the oil outlet of the described feedback oil circuit of getting off;
The described feedback oil circuit of getting off connects the described high-pressure oil passage of getting off; The oil outlet of described primary feedback oil circuit connects the feedback port of described pump, to control the variable of described pump;
When getting on the bus mode of operation, described load feedback pressure signal of getting on the bus via described feedback oil circuit, the shuttle valve of getting on the bus, flows to described primary feedback oil circuit successively;
When getting off mode of operation, described load feedback pressure signal of getting off via described feedback oil circuit, the shuttle valve of getting off, flows to described primary feedback oil circuit successively.
4. device as claimed in claim 3, is characterized in that, also comprises:
The second by pass valve, described the second by pass valve are arranged on second oil inlet and the pipeline between described fuel tank of described shuttle valve;
When the pressure of the second oil inlet of described shuttle valve surpasses the safe pressure that described the second by pass valve sets, described the second by pass valve is opened, the described feedback oil circuit of getting off flows back to described fuel tank by described the second by pass valve, until the pressure of the second oil inlet of described shuttle valve reaches the safe pressure of described setting.
5. device as claimed in claim 4, is characterized in that, also comprises:
Unloader valve, described unloader valve are arranged on second oil inlet and the pipeline between described fuel tank of described shuttle valve;
Get off when not working when described, the described feedback oil circuit of getting off flows back to described fuel tank by described unloader valve.
6. device as claimed in claim 4, is characterized in that, also comprises:
The first damping, described the first damping is arranged on the described high-pressure oil passage of getting off.
7. device as claimed in claim 4, is characterized in that, also comprises:
The second damping, described the second damping are arranged on the described feedback oil circuit of getting off.
8. device as claimed in claim 1, is characterized in that,
Described pump is load sensitive pump.
9. device as claimed in claim 1, is characterized in that,
Described main valve is three position four-way directional control valve, three position three-way change valve, two-position four way change valve or two position three way directional control valve.
10. a load-sensitive hydraulic system, is characterized in that, comprises the shifter of getting on or off the bus as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220578803 CN202923545U (en) | 2012-11-05 | 2012-11-05 | Loading and unloading switching device and load-sensitive hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220578803 CN202923545U (en) | 2012-11-05 | 2012-11-05 | Loading and unloading switching device and load-sensitive hydraulic system |
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| Publication Number | Publication Date |
|---|---|
| CN202923545U true CN202923545U (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220578803 Expired - Lifetime CN202923545U (en) | 2012-11-05 | 2012-11-05 | Loading and unloading switching device and load-sensitive hydraulic system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108087365A (en) * | 2017-12-19 | 2018-05-29 | 宁波文泽机电技术开发有限公司 | Oil circuit automatic transfer valve |
| CN109185241A (en) * | 2018-11-22 | 2019-01-11 | 江苏宏昌天马物流装备有限公司 | Lorry-mounted crane switching valve of getting on or off the bus |
| CN110578728A (en) * | 2019-10-11 | 2019-12-17 | 广东冠邦科技有限公司 | Automatic change valve |
| CN111101553A (en) * | 2020-01-14 | 2020-05-05 | 徐州徐工矿业机械有限公司 | Electric control rotary brake release system of hydraulic excavator and use method |
-
2012
- 2012-11-05 CN CN 201220578803 patent/CN202923545U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108087365A (en) * | 2017-12-19 | 2018-05-29 | 宁波文泽机电技术开发有限公司 | Oil circuit automatic transfer valve |
| CN109185241A (en) * | 2018-11-22 | 2019-01-11 | 江苏宏昌天马物流装备有限公司 | Lorry-mounted crane switching valve of getting on or off the bus |
| CN109185241B (en) * | 2018-11-22 | 2023-10-13 | 江苏宏昌天马物流装备有限公司 | Loading and unloading switching valve for lorry-mounted crane |
| CN110578728A (en) * | 2019-10-11 | 2019-12-17 | 广东冠邦科技有限公司 | Automatic change valve |
| CN111101553A (en) * | 2020-01-14 | 2020-05-05 | 徐州徐工矿业机械有限公司 | Electric control rotary brake release system of hydraulic excavator and use method |
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Effective date of registration: 20170207 Address after: 221004 Jiangsu Province, Xuzhou City Yunlong District No. 165 Patentee after: XCMG FIRE-FIGHTING SAFETY EQUIPMENT Co.,Ltd. Address before: 221004 Xuzhou, Zhejiang Province, Jiangsu Road No. 165 Patentee before: Xuzhou Heavy Machinery Co.,Ltd. |
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Granted publication date: 20130508 |
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